Item Type: Tapping Collet_x000D_ Model: GT24-JIS-M16_x000D_ Material: High speed steel_x000D_ Specification: M16_x000D_ M16 Suitable Tap Size: Shank Diameter x Square: Approx. 14 x 11.2mm / 0.6 x 0.4in_x000D_ Uses: Widely used in tapping machines, drilling machines, milling machines, boring machines, electric tools, pneumatic tools and other equipment with CCW spindles_x000D_ How to Use:_x000D_ 1. Press the knurled position of the handle body with the thumb of your left hand and pull it in the direction of the arrow_x000D_ 2. The handle body is aligned with the concave and convex keys of the chuck, install the chuck into the shank body_x000D_ 3. When disassembling the chuck, pinch the knurled key with your hand and pull the chuck back and it will be ejected automatically_x000D_ Install Steps:_x000D_ 1. Thumbs press down the spring_x000D_ 2. Put the tap into the chuck hole and release your thumb